Device and method for remotely determining the impulse response of an object using electromagnetic radiation

摘要

The invention relates to a device and a method for remotely determining the impulse response of an object irradiated by a pulse train with low-intensity pulses of electromagnetic radiation. A complete representation of the pulse train transmitted towards the object is known in advance, and a convolution between the signal representation of the pulse train and the signal of the detected response from the object is performed, which provides a signal representation of the impulse response. Said signal representation can then be used, e.g., to analyze possible defects in the structure of the object.

主权项

1. A device for remotely generating and reading the impulse response from an excitation of an object (2), the device comprising:
a device (1) for emitting electromagnetic radiation; a detection device (3) arranged to detect the mechanical response from an object irradiated by the electromagnetic radiation; a signal processing unit (S) coupled to said detection device (3) and arranged to receive a signal representation of the response from said detection device; wherein said device (1) for emitting electromagnetic radiation is arranged to transmit pulses of a predetermined wavelength and intensity in a pulse train (O) in a predetermined sequential pattern, wherein said device (1) is arranged to emit electromagnetic radiation having an intensity that provides that a transfer function with the pulses of electromagnetic radiation from the device (1) as input and the mechanical response of the object detected by the detection device (3) as output is linear and time-invariant, and that said signal processing unit (S) is arranged to perform a convolution between a signal representation of said pulse train (O) and a signal representation (V) of said mechanical response (M) and noise (B) detected by the detection device (3) in order to obtain thereby a signal representation (V′) of the impulse response from the excited object (2).